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Hydrogen Peroxide Experiments

Hydrogen peroxide experiment
Hydrogen peroxide is active, interesting and versatile in experimental investigation. Today, several experiments with hydrogen peroxide as the core are described in detail.

First, catalytic decomposition experiment
Take a clean test tube, inject an appropriate amount of hydrogen peroxide solution, and observe that it is calm. Then, add a little manganese dioxide powder. In an instant, bubbles appear in the solution, and it becomes more and more intense. This is because manganese dioxide acts as a catalyst to accelerate the decomposition of hydrogen peroxide to generate water and oxygen. The reaction formula is: $2H_ {2} O_ {2}\ stackrel {MnO_ {2 }}{=\!=\!=} 2H_ {2} O + O_ {2}\ uparrow $. The wooden strips with Mars were placed at the mouth of the test tube, and the wooden strips were reignited to prove that oxygen was indeed generated. This experiment highlights the influence of catalysts on the rate of chemical reactions, which can be the cornerstone of exploring the principle of catalysis.

Dioxide experiment
Prepare a beaker, hold a certain amount of potassium iodide solution, drop a few drops of starch solution, the solution is colorless. Slowly add hydrogen peroxide solution, and the color of the solution can be seen to gradually change until it reaches blue. This is hydrogen peroxide oxidizing potassium iodide to iodine elemental substance, and iodine elemental substance turns blue when exposed to starch. The reaction formula is: $H_ {2} O_ {2} + 2KI + H_ {2} SO_ {4} = I_ {2} + K_ {2} SO_ {4} + 2H_ {2} O $. This experiment shows the oxidizability of hydrogen peroxide, which is of great significance in the study of redox reactions.

Third, the reaction experiment with substances
Take a little black copper oxide powder, put it in a test tube, and add an appropriate amount of hydrogen peroxide solution. After a while, the color of the solution gradually changed, and the copper oxide seemed to dissolve. This is the chemical reaction between hydrogen peroxide and copper oxide, which reflects the property that hydrogen peroxide can interact with some metal oxides, and is of great value for the study of the reaction law between substances.

The above experiments, with hydrogen peroxide as the core, are carried out from the dimensions of catalytic decomposition, oxidation and reaction with other substances, providing many interesting perspectives and paths for exploring the mysteries of the chemical world.